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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Mock Test - Motion in one Dimension

  • question_answer
    A bird flies to and fro between two cars which move with velocities \[{{v}_{1}}\] = 20 m/s and \[{{v}_{2}}\] = 30 m/s. If the speed of the bird is \[{{v}_{3}}\] = 10 m/s and the initial distance of separation between them is d= 2 km, find the total distance covered by the bird till the cars meet.

    A) 2000 m

    B) 1000 m

    C) 400 m  

    D) 200 m

    Correct Answer: C

    Solution :

    [c] Time to meet the cars: \[t=\frac{d}{{{v}_{1}}+{{v}_{2}}}\] Distance travelled by bird in this time \[s={{v}_{3}}t=\frac{{{v}_{3}}d}{{{v}_{1}}+{{v}_{2}}}=\frac{10\times 2000}{(20+30)}=400m\]


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